Erwin kramer



Patented Mar. 27, 1923.

UNITED STATES PATENT OFFICE.

ERWIN KRAMER, OF DENTZ, NEAR COLOGNE, AND LUDWIG ZEH, OF WIESDORF, NEARCOLOGNE, GERMANY, ASSIGNORS T FARBENFABRIKEN VORM. FRIEDR. BAYER AND('30., OF LEVERKUSEN, NEAR COLOGNE-ON-THE-RI-IINE, GERMANY.

SULPHUR DYE.

No Drawing.

To all whom-it may concern:

Be it known that we, ERWIX KRAMER and LUDWIG Znrr, citizens of Germany,residing at Dentz, near Cologne, and Tiesdorf, nearCologne-on-the-Rhine, Prussia, Germany have invented new and usefulImprovements in Sulphur Dyes, of which the following is a specification.

Our invention relates to the manufacture 1 and productionof new bluesulphur colors which are obtained by treating with alkali polysulfidesthe indophenols of the formula:

L 1\ all ll (in which formula R means an alkyl such as CH C H C H etc, Ran aryl such as phenyl, tolyl, etc., and R" a mononuclear arylen such asC H C H Cl etc.) or the corresponding leucoindopheno'ls. The new dyesare after being dried and pulverized dark blue powders soluble in concentrated sulfuric acid generally with a bluish coloration. They dyecotton from a hydrosulfite vat or from a bath containing sodium sulfidepure blue shades fast to boil- Applieation filed April 17, 1922. SerialNo. 553,977.

ing to chlorin and to light. They can also be used in printing accordingto the methods known for printing vat dyes.

In order to illustrate the new process more fully the following exampleis given, 40 the parts being by weight In a vessel provided with areflux condenser the indophenol of the formula:

Our new dyestuff is after being dried and pulverized a dark blue powder.It

obtained from the indophenol of the formula is soluble in concentratedsulfuric acid with a pure blue coloration. It dyes cotton from a yellowhydrosulfite vat a pure greenish- 081154312 CH5 blue shade fast toboiling, chlorin and light. N p 5 A similar dye is produced from theindo r i I phenol obtainable from methylbenzylanilin and4-amino-2.6-dichlorophenol. I

We claim p 1. The herein described new sulphur dyes I 40 10 obtainedfrom indophenols of the formula: r 1

RCH2 R (in which R means an alkyl radical, R vmeans an aryl radical andR" means a mononuclear arylen); which are after he i ing dried andpulverized dark blue powders 30 tially as described.

'2. The herein described new sulphur dye which dye is after being driedand pulverized a dark blue powder soluble inconcntrated sulfuric acidwith a pure blue coloration; and dyeing unmordanted cotton from 'ahydrosulfite vat in greenish-blue shades fast to light, to chlorin andto boiling, substantially as described.

In testimony whereof we have hereunto set our hands in the presence oftwo subscriblng witnesses.

'ERVVIN KRAMER.

LUDWIG ZEHQ lVitnesses I'IEINZ W. HAAs, Euro L. RooXLINc.

